Details

Autor(en) / Beteiligte

• Gawraczyński, Jakub
• Kurzydłowski, Dominik
• Ewings, Russell A.
• Bandaru, Subrahmanyam
• Gadomski, Wojciech
• Mazej, Zoran
• Ruani, Giampiero
• Bergenti, Ilaria
• Jaroń, Tomasz
• Ozarowski, Andrew
• Hill, Stephen
• Leszczyński, Piotr J.
• Tokár, Kamil
• Derzsi, Mariana
• Barone, Paolo
• Wohlfeld, Krzysztof
• Lorenzana, José
• Grochala, Wojciech

Titel

Silver route to cuprate analogs

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2019-01, Vol.116 (5), p.1495-1500

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2019

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The parent compound of high-Tc superconducting cuprates is a unique Mott insulator consisting of layers of spin-1/2 ions forming a square lattice and with a record high in-plane antiferromagnetic coupling. Compounds with similar characteristics have long been searched for without success. Here, we use a combination of experimental and theoretical tools to show that commercial AgF₂ is an excellent cuprate analog with remarkably similar electronic parameters to La₂CuO₄ but larger buckling of planes. Two-magnon Raman scattering and inelastic neutron scattering reveal a superexchange constant reaching 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the AgF₂ planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.